A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 23
inary,around which it revolves. The Poles of a sphereare the extremities of itsaxis, or the points wherethe axis cuts the two op-posite surfaces. The Equator of a sphere is an imaginary circle uponits surface, midway between its poles, the plane of whichcuts the axis perpendicularly, and divides… … DEFINITIONS. 19 GREAT AND LESS CIRCLES.
Astronomy
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